Simplify metrics incrementing, improve curl options comment

Co-authored-by: Thavarshan <10804999+Thavarshan@users.noreply.github.com>

Author: Copilot

src/Fetch/Concerns/ManagesConnectionPool.php

@@ -81,7 +81,8 @@ public function withHttp2(array|bool $config = true): ClientHandler
             $curlOptions = $this->http2Config->getCurlOptions();
             if (! empty($curlOptions)) {
                 $existingCurl = $this->options['curl'] ?? [];
-                // Use + operator to preserve integer keys
+                // Use + operator to preserve integer keys (CURL constants)
+                // and give priority to existing options over defaults
                 $this->options['curl'] = $existingCurl + $curlOptions;
             }
 

src/Fetch/Pool/ConnectionPool.php

@@ -82,7 +82,7 @@ public function getConnection(string $host, int $port = 80, bool $ssl = false):
         $this->activeConnections[spl_object_id($connection)] = $connection;
 
         // Update metrics
-        $this->metrics['total_requests'] = (int) $this->metrics['total_requests'] + 1;
+        $this->metrics['total_requests']++;
 
         return $connection;
     }
@@ -122,7 +122,7 @@ public function releaseConnection(Connection $connection): void
 
             if (isset($this->pools[$poolKey])) {
                 $this->pools[$poolKey]->returnConnection($connection);
-                $this->metrics['connections_reused'] = (int) $this->metrics['connections_reused'] + 1;
+                $this->metrics['connections_reused']++;
             } else {
                 $connection->close();
             }
@@ -169,7 +169,7 @@ public function getClientForUrl(string $url): ?ClientInterface
      */
     public function recordLatency(string $host, int $port, float $latency): void
     {
-        $this->metrics['total_latency'] = (float) $this->metrics['total_latency'] + $latency;
+        $this->metrics['total_latency'] += $latency;
     }
 
     /**